.input-box {
    position: relative;
    display: inline-block;
}

.input {
    padding: 0 40px 0 20px;
    width: 160px;
    height: 38px;
    font-size: 14px;
    border: 1px solid #eee;
    border-radius: 40px;
    background: white;
    transition: width .5s;
    transition-delay: .1s;
}

.span {
    position: absolute;
    top: 4px;
    right: 5px;
    width: 30px;
    height: 30px;
    line-height: 30px;
    padding: 0;
    color: #969696;
    text-align: center;

    border-radius: 50%;
    font-size: 15px;
    cursor: pointer;
}
.input:focus {
    width: 280px;
    outline: none;
    box-shadow: none;
}

.input:focus+.span {
    background-color: #73ccff;
    color: #fff;
}
.mb20 {
     margin-bottom: 20px;
 }
/*测试*/
